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Fair value of financial instruments and marketable securities - Warrants and SARs (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Changes in the fair value of warrant liability and SARs liability      
Weighted-average discount rate - finance lease 7.80%    
SARs      
Changes in the fair value of warrant liability and SARs liability      
Ending Balance $ 0    
SARs      
Changes in the fair value of warrant liability and SARs liability      
Beginning Balance 3,186    
Ending Balance     $ 3,186
Measurement Input, Option Volatility | SARs      
Fair value of warrant liability      
Rights Exchange settlement     0.2893
Measurement Input, Risk Free Interest Rate | SARs      
Fair value of warrant liability      
Rights Exchange settlement     0.0019
Measurement Input, Expected Term | SARs      
Fair value of warrant liability      
Expected term (in years)     3 days
Minimum | SARs      
Fair value of warrant liability      
Rights Exchange settlement | $ / shares     6.76
Maximum | SARs      
Fair value of warrant liability      
Rights Exchange settlement | $ / shares     30.86
Common stock | Measurement Input, Share Price | SARs      
Fair value of warrant liability      
Rights Exchange settlement | $ / shares     48.03
Agilis | Liability, Net Sales Milestones and Royalties      
Changes in the fair value of warrant liability and SARs liability      
Beginning Balance 65,800    
Ending Balance $ 95,900   $ 65,800
Agilis | Liability, Net Sales Milestones and Royalties | Measurement Input, Discount Rate | Commitments      
Fair value of warrant liability      
Rights Exchange settlement 0.120   0.145
Agilis | Liability, Net Sales Milestones and Royalties | Minimum | Probability of Success | Commitments      
Fair value of warrant liability      
Rights Exchange settlement 0.25   0.25
Agilis | Liability, Net Sales Milestones and Royalties | Minimum | Percentage of Sales for Royalties | Commitments      
Fair value of warrant liability      
Rights Exchange settlement 0.02   0.02
Agilis | Liability, Net Sales Milestones and Royalties | Minimum | Potential Net Sales Milestones [Member] | Commitments      
Fair value of warrant liability      
Alternative Investment, Milestone $ 0   $ 0
Agilis | Liability, Net Sales Milestones and Royalties | Maximum | Probability of Success | Commitments      
Fair value of warrant liability      
Rights Exchange settlement 0.94   0.89
Agilis | Liability, Net Sales Milestones and Royalties | Maximum | Percentage of Sales for Royalties | Commitments      
Fair value of warrant liability      
Rights Exchange settlement 0.06   0.06
Agilis | Liability, Net Sales Milestones and Royalties | Maximum | Potential Net Sales Milestones [Member] | Commitments      
Fair value of warrant liability      
Alternative Investment, Milestone $ 150,000   $ 150,000
Agilis | Development and Regulatory Milestone      
Changes in the fair value of warrant liability and SARs liability      
Beginning Balance 290,500    
Ending Balance $ 138,200   $ 290,500
Agilis | Development and Regulatory Milestone | Minimum | Probability of Success | Commitments      
Fair value of warrant liability      
Rights Exchange settlement 0.25   0.25
Agilis | Development and Regulatory Milestone | Minimum | Development and Regulatory Milestone | Commitments      
Fair value of warrant liability      
Alternative Investment, Milestone $ 0   $ 0
Agilis | Development and Regulatory Milestone | Minimum | Measurement Input, Discount Rate | Commitments      
Fair value of warrant liability      
Rights Exchange settlement 0.031   0.022
Agilis | Development and Regulatory Milestone | Maximum | Probability of Success | Commitments      
Fair value of warrant liability      
Rights Exchange settlement 0.94   0.94
Agilis | Development and Regulatory Milestone | Maximum | Development and Regulatory Milestone | Commitments      
Fair value of warrant liability      
Alternative Investment, Milestone $ 381,000   $ 555,000
Agilis | Development and Regulatory Milestone | Maximum | Measurement Input, Discount Rate | Commitments      
Fair value of warrant liability      
Rights Exchange settlement 0.053   0.047
Significant unobservable inputs (level 3)      
Changes in the fair value of warrant liability and SARs liability      
Additions   $ 0  
Significant unobservable inputs (level 3) | SARs      
Changes in the fair value of warrant liability and SARs liability      
Beginning Balance $ 3,186 3,814 $ 3,814
Additions 0    
Change in fair value 0 2,236  
Payments (3,186) (3,815)  
Rights Exchange settlement 0    
Ending Balance 0 2,235 3,186
Significant unobservable inputs (level 3) | Commitments      
Changes in the fair value of warrant liability and SARs liability      
Beginning Balance 290,500 257,040 257,040
Additions 0 0  
Change in fair value (13,120) 28,260  
Payments 0 0  
Rights Exchange settlement (139,180)    
Ending Balance 138,200 285,300 290,500
Significant unobservable inputs (level 3) | Agilis | Liability, Net Sales Milestones and Royalties      
Changes in the fair value of warrant liability and SARs liability      
Beginning Balance 65,800 53,200 53,200
Additions 0 0  
Change in fair value 30,100 6,400  
Payments 0 0  
Rights Exchange settlement 0    
Ending Balance $ 95,900 $ 59,600 $ 65,800